A Key Role for Leukemia Inhibitory Factor in C26 Cancer Cachexia

被引:100
作者
Seto, Danielle N. [1 ]
Kandarian, Susan C. [1 ]
Jackman, Robert W. [1 ]
机构
[1] Boston Univ, Dept Hlth Sci, Boston, MA 02215 USA
基金
美国国家卫生研究院;
关键词
SKELETAL-MUSCLE; COLON-26; ADENOCARCINOMA; STAT3; INTERLEUKIN-6; CELLS; DIFFERENTIATION; PATHWAY; MICE; TRANSCRIPTION; ACTIVATION;
D O I
10.1074/jbc.M115.638411
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Cachexia is an exacerbating event in many types of cancer that is strongly associated with a poor prognosis. We have identified cytokine, signaling, and transcription factors that are required for cachexia in the mouse C26 colon carcinoma model of cancer. C2C12 myotubes treated with conditioned medium from C26 cancer cells induced atrophy and activated a STAT-dependent reporter gene but not reporter genes dependent on SMAD, FOXO, C/EBP, NF-kappa B, or AP-1. Of the gp130 family members IL-11, IL-6, oncostatinM(OSM), and leukemia inhibitory factor (LIF), only OSM and LIF were sufficient to activate the STAT reporter in myotubes. LIF was elevated in C26 conditioned medium (CM), but IL-6, OSM, TNF alpha, and myostatin were not. A LIF-blocking antibody abolished C26 CM-induced STAT reporter activation, STAT3 phosphorylation, and myotube atrophy but blocking antibodies to IL-6 or OSM did not. JAK2 inhibitors also blocked C26 CM-induced STAT reporter activation, STAT3 phosphorylation, and atrophy in myotubes. LIF at levels found in the C26 CM was sufficient for STAT reporter activation and atrophy in myotubes. In vivo, an increase in serum LIF preceded the increase in IL-6 in mice with C26 tumors. Overexpression of a dominant negative Stat3C beta-EGFP gene in myotubes and in mouse muscle blocked the atrophy caused by C26 CM or C26 tumors, respectively. Taken together, these data support an important role of LIF-JAK2-STAT3 in C26 cachexia and point to a therapeutic approach for at least some types of cancer cachexia.
引用
收藏
页码:19976 / 19986
页数:11
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